CVE-2021-44981 Explained : Impact and Mitigation

QuickBox Pro versions 2.5.8 and below are vulnerable to remote code execution due to improper sanitization of shell arguments, allowing attackers to execute commands and potentially escalate privileges.

Understanding CVE-2021-44981

QuickBox Pro v2.5.8 and below contain a critical vulnerability that can lead to remote code execution (RCE) and privilege escalation.

What is CVE-2021-44981?

In QuickBox Pro v2.5.8 and earlier versions, a vulnerability exists in the config.php file. This vulnerability allows a malicious actor to execute arbitrary shell commands by manipulating a GET parameter improperly passed into a shell_exec('') function without adequate sanitization. Since the media server runs as root by default, attackers can exploit this flaw to run commands with elevated privileges.

The Impact of CVE-2021-44981

The vulnerability permits remote code execution, enabling threat actors to run commands on the affected system. Moreover, attackers can leverage this flaw for privilege escalation within the media server environment.

Technical Details of CVE-2021-44981

QuickBox Pro v2.5.8 and earlier are susceptible to a critical security issue that facilitates unauthorized command execution through the media server.

Vulnerability Description

The config.php file in QuickBox Pro versions 2.5.8 and below mishandles a GET parameter value, allowing unauthenticated users to execute arbitrary commands via the shell_exec('') function without proper input validation.

Affected Systems and Versions

Product: QuickBox Pro
Versions: 2.5.8 and below

Exploitation Mechanism

Attackers exploit a flaw in the config.php file to inject malicious input via a GET parameter, triggering the execution of unauthorized shell commands, including the use of sudo for privilege escalation.

Mitigation and Prevention

Immediate action is crucial to secure systems and prevent unauthorized access through the QuickBox Pro vulnerability.

Immediate Steps to Take

Update QuickBox Pro to the latest version to patch the vulnerability.
Implement proper input validation and sanitization mechanisms in the codebase.
Restrict root access and limit the use of sudo commands.

Long-Term Security Practices

Conduct regular security audits and code reviews to identify and address any vulnerabilities promptly.
Train developers and administrators on secure coding practices and the importance of input validation.
Monitor system logs for suspicious activities that may indicate unauthorized access attempts.

Patching and Updates

Ensure timely installation of software updates and security patches released by QuickBox Pro to address known vulnerabilities.